209111225 mechanical nonlin 13 0 ws 03b contact symmetry
TRANSCRIPT
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Customer Training Material
or s op
S mmetric vs. As mmetric
Structural Nonlinearities
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ANSYS Mechanical Structural Nonlinearities
Customer Training MaterialWorkshop 3B: Symmetric vs. Asymmetric
Goal
Use contact to predict pressure profile at
spherical interface between ball and socket.
Compare and contrast Symmetric Vs.
Asymmetric Contact behavior.
2D Axisymmetric model of ball and socket joint
Materials:
Contact between parts:
One frictional region on spherical interface
Ball
.
Loads & Boundary Conditions:
Socket is fixed at the top
Ball has a 1000N force a lied to it in vertical -Y
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direction
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ANSYS Mechanical Structural Nonlinearities
Customer Training Material Workshop 3B: Symmetric vs. Asymmetric
Steps to Follow:
Restore Archive browse for file W3b-Socket.wbpz
Save as
File name: W3b-Socket
*
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Customer Training Material Workshop 3B: Symmetric vs. Asymmetrice ro ec c ema c s ou oo e e p c ure e ow.
Note: The engineering data, geometry, loads and boundary conditionsand preliminary contact region have already been set up. It remains toredefine the contact behavior and compare and contrast contact results.
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ANSYS Mechanical Structural Nonlinearities
Customer Training Material Workshop 3B: Symmetric vs. Asymmetric
Highlight the Engineering Data Cells double
click to open and verify the predefined material
properties
, ,
system. If not, fix this by clicking on Utility Menu>Units>Metric(Tonne, mm,..)
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ANSYS Mechanical Structural Nonlinearities
Customer Training Material Workshop 3B: Symmetric vs. Asymmetric
Return to the project schematic page
Double click (or RMB=>Edit) on the Model Cell to open Mechanical
Session
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ANSYS Mechanical Structural Nonlinearities
Customer Training Material Workshop 3B: Symmetric vs. Asymmetric
Once inside the Mechanical application, verify the working unit system
Unit > Metric (mm,kg,N,s,mV,mA)
Expand each folder in the project tree to become familiar with the
. , ,
loads as described on the slide 2.
modify the specifications as follows:
Type = Frictional = .
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Customer Training Material Workshop 3B: Symmetric vs. Asymmetric
Highlight the Analysis Settings Folder:
Turn Large Deflection ON
Take default settings for everything else
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Customer Training Material Workshop 3B: Symmetric vs. Asymmetric
Execute a Solve:
Highlight the Solution Information
branch and note the following
from the Solver output:
ecause o e . r c on
coefficient, autotime stepping
starts with 5 substeps.
Turning on large deflection will
ensure stress stiffening effects
are included
From the Force Conver ence
Graph, the solution convergeseasily
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Customer Training Material Workshop 3B: Symmetric vs. Asymmetric
Post Process Total Deformation and Equivalent Stress
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ANSYS Mechanical Structural Nonlinearities
Customer Training Material Workshop 3B: Symmetric vs. Asymmetric
g g e o u on ranc
RMB > Insert > Contact Tool
Hi hli ht the newl inserted
Contact Tool
RMB > Insert >
Pressure
ene ra on
RMB > Evaluate Results
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Customer Training Material Workshop 3B: Symmetric vs. Asymmetric eca , s s a symme r c con ac reg on. ence, ere are con ac resu s
available on both the contact and target sides.
Using the Contact Tool, compare and contrast the contact results (status,
,
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ANSYS Mechanical Structural Nonlinearities
Customer Training Material Workshop 3B: Symmetric vs. Asymmetric
Note the differences between the contact and target pressureprofiles.
Which one is correct?
Tar et Side Onl
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Answer: Neither. The correct answer is an average of the two profiles.
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Customer Training Material Workshop 3B: Symmetric vs. Asymmetric
Return to the Connection Folder.
Highlight the frictional contact region
Change Behavior to Asymmetric
Rerun the solution
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Customer Training Material Workshop 3B: Symmetric vs. Asymmetric
Post process the contact results as before. Note that there is now only one
answer (on the contact side) and it is an approximate average of the two
results that were available with the symmetric contact.
. . .
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Contact Side Only Target Side Only
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ANSYS Mechanical Structural Nonlinearities
Customer Training Material Workshop 3B: Symmetric vs. Asymmetric
Note that regardless of which contact behavior is used (Symmetric or
Asymmetric) in this example, the overall model results for deformation and
equivalent stress remain essentially the same. Symmetric behavior is
.
be more challenging to interpret.
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